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<Title>Gradient Multi-Bar Chart</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Gradient Multi-Bar Chart</p>
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<img src="images/gradientmultibar.png" width='540' height='375'>
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This example demonstrates a multi-bar chart with bar gradient shading and gradient color for plot area background.<br><br>
<ul><li> The gradient plot area background is configured by using <a href="BaseChart.linearGradientColor.htm">BaseChart.linearGradientColor</a> to define the gradient color, then use <a href="XYChart.setPlotArea.htm">XYChart.setPlotArea</a> to apply it to the plot area.<br><br>
<li> The <a href="XYChart.setPlotArea.htm">XYChart.setPlotArea</a> also sets the plot area border and grid line colors to white.<br><br>
<li> The bar gradient effect is defined using <a href="Chart.barLighting.htm">Chart.barLighting</a>, then applied to the bars using <a href="Layer.setBorderColor.htm">Layer.setBorderColor</a>.</ul>
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/gradientmultibar.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%
// The data for the bar chart
double[] data0 = {100, 125, 245, 147, 67};
double[] data1 = {85, 156, 179, 211, 123};
double[] data2 = {97, 87, 56, 267, 157};
String[] labels = {"Mon", "Tue", "Wed", "Thur", "Fri"};

// Create a XYChart object of size 540 x 375 pixels
XYChart c = new XYChart(540, 375);

// Add a title to the chart using 18pt Times Bold Italic font
c.addTitle("Average Weekly Network Load", "Times New Roman Bold Italic", 18);

// Set the plotarea at (50, 55) and of 440 x 280 pixels in size. Use a vertical gradient color from
// grey (888888) to black (000000) as background. Set border and grid lines to white (ffffff).
c.setPlotArea(50, 55, 440, 280, c.linearGradientColor(0, 55, 0, 335, 0x888888, 0x000000), -1,
    0xffffff, 0xffffff);

// Add a legend box at (50, 25) using horizontal layout. Use 10pt Arial Bold as font, with
// transparent background.
c.addLegend(50, 25, false, "Arial Bold", 10).setBackground(Chart.Transparent);

// Set the x axis labels
c.xAxis().setLabels(labels);

// Draw the ticks between label positions (instead of at label positions)
c.xAxis().setTickOffset(0.5);

// Set axis label style to 8pt Arial Bold
c.xAxis().setLabelStyle("Arial Bold", 8);
c.yAxis().setLabelStyle("Arial Bold", 8);

// Set axis line width to 2 pixels
c.xAxis().setWidth(2);
c.yAxis().setWidth(2);

// Add axis title
c.yAxis().setTitle("Throughput (MBytes Per Hour)");

// Add a multi-bar layer with 3 data sets and 4 pixels 3D depth
BarLayer layer = c.addBarLayer2(Chart.Side, 4);
layer.addDataSet(data0, 0x66aaee, "Server #1");
layer.addDataSet(data1, 0xeebb22, "Server #2");
layer.addDataSet(data2, 0xcc0000, "Server #3");

// Set bar border to transparent. Use bar gradient lighting with light intensity from 0.75 to 1.75.
layer.setBorderColor(Chart.Transparent, Chart.barLighting(0.75, 1.75));

// Configure the bars within a group to touch each others (no gap)
layer.setBarGap(0.2, Chart.TouchBar);

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart
viewer.setImageMap(c.getHTMLImageMap("", "",
    "title='{dataSetName} on {xLabel}: {value} MBytes/hour'"));
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Gradient Multi-Bar Chart&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Gradient Multi-Bar Chart
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here is the chart image ****** --&gt;
    &lt;%= viewer.renderHTML(response) %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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